append properties to old object

[wangyoutian]

// Given:

class A{
  public int b;
  public int c;
 static public A Create(){ return new A(){ b=3  }; }
}

//, we can now do this:
 
var c= new A(){ b=1};

// ; Can we extend the above properties assigning to also old objects in a way like this:

var d= A.Create(){  c=5 };

//, rather than what we currently have to do:

var d=A.Create();
d.c=5;

//?

//  The syntax shall be same or similar to how we assign properties for "new"ing an object.

[yaakov-h]

#803 / #6602